/*
 * @Descripttion:
 * @version:
 * @Author: 周子尧
 * @Date: 2021-01-27 11:21:27
 * @LastEditors: 周子尧
 * @LastEditTime: 2021-02-02 10:35:15
 */
const Mock = require('mockjs')
const fs = require('fs')

var mocks = []
if (fs.readdirSync) {
  const modulesFiles = fs.readdirSync('./mock/modules')
  mocks = modulesFiles.reduce((modules, modulePath) => {
    const value = require(`./modules/${modulePath}`)
    return [...modules, ...value]
  }, [])
} else {
  const modulesFiles = require.context('./modules', true, /\.js$/)
  mocks = modulesFiles.keys().reduce((modules, modulePath) => {
    const value = modulesFiles(modulePath)
    return [...modules, ...value]
  }, [])
}

// for front mock
// please use it cautiously, it will redefine XMLHttpRequest,
// which will cause many of your third-party libraries to be invalidated(like progress event).
function mockXHR() {
  // mock patch
  // https://github.com/nuysoft/Mock/issues/300
  Mock.XHR.prototype.proxy_send = Mock.XHR.prototype.send
  Mock.XHR.prototype.send = function() {
    if (this.custom.xhr) {
      this.custom.xhr.withCredentials = this.withCredentials || false

      if (this.responseType) {
        this.custom.xhr.responseType = this.responseType
      }
    }
    this.proxy_send(...arguments)
  }

  function XHR2ExpressReqWrap(respond) {
    return function(options) {
      let result = null
      if (respond instanceof Function) {
        const { body, type, url } = options
        // https://expressjs.com/en/4x/api.html#req
        result = respond({
          method: type,
          body: JSON.parse(body),
          query: param2Obj(url)
        })
      } else {
        result = respond
      }
      return Mock.mock(result)
    }
  }

  for (const i of mocks) {
    Mock.mock(new RegExp(i.url), i.type || 'get', XHR2ExpressReqWrap(i.response))
  }
}

/**
 * @param {string} url
 * @returns {Object}
 */
function param2Obj(url) {
  const search = decodeURIComponent(url.split('?')[1]).replace(/\+/g, ' ')
  if (!search) {
    return {}
  }
  const obj = {}
  const searchArr = search.split('&')
  searchArr.forEach(v => {
    const index = v.indexOf('=')
    if (index !== -1) {
      const name = v.substring(0, index)
      const val = v.substring(index + 1, v.length)
      obj[name] = val
    }
  })
  return obj
}

module.exports = {
  mocks,
  mockXHR
}

